It is realy simple to install a Tellstick on the Raspberry PI. For the one that is interested the following will install everything you need on a clean debian from the Raspberry PI downloads section.
sudo apt-get install libftdi1
Add the following line to your /etc/apt/sources.list:
deb http://download.telldus.com/debian/ stable main
wget http://download.telldus.se/debian/telldus-public.key
sudo apt-key add telldus-public.key
sudo apt-get update
sudo apt-get install telldus-core